#include <iostream>

using std::cout;
using std::endl;

class Example
{
public:
    void print() const
    {
        ++_ix;
        cout << "_ix = " << _ix << endl
             << "_iy = " << _iy << endl;
    }
private:
    mutable int _ix;
    int _iy;
};

void test()
{

}

int main(int argc, char *argv[])
{
    test();
    return 0;
}

